Update index.rst

Update style

docs/source/index.rst

 .. MFiX-EXA documentation master file, created Thu Aug  2 12:19:39 2018.
 
-Welcome to MFiX-EXA's documentation!
+Welcome to MFIX-EXA's documentation!
 ====================================
 
-MFiX-Exa is a new multiphase computational fluid dynamics (CFD) modeling tool
+MFIX-Exa is a new multiphase computational fluid dynamics (CFD) modeling tool
 that can take advantage of massively parallel high performance computers (HPC)
 with the goal of scaling well at exascale.  It combines the underlying physics
-from the existing `MFiX <https://mfix.netl.doe.gov/>`_ code with the
+from the existing `MFIX <https://mfix.netl.doe.gov/>`_ code with the
 `AMReX <https://amrex-codes.github.io/amrex/>`_ framework, creating the next
 generation, high performance, multiphase CFD workhorse.
 
 .. image:: /images/particle_banner.png
 
-MFiX-Exa is under active development as part of the MFiX-Exa
+MFIX-Exa is under active development as part of the MFIX-Exa
 application project in DOE's
 `Exascale Computing Project (ECP) <https://www.exascaleproject.org/>`_. All of
-MFiX-Exa's development is done in the
+MFIX-Exa's development is done in the
 `NETL gitlab repository <https://mfix.netl.doe.gov/gitlab/exa/mfix>`_, with
 active development in the develop branch. Changes are merged into
 the master branch at the beginning of each month.
@@ -28,7 +28,7 @@ solver with chemistry, heat transfer, complex geometry, and two particle models:
 2. **Particle in cell method (PIC)** - Particles are group in parcels and see
    other parcels through a stress gradient.
 
-To get started with MFiX-Exa, follow the user guide sections:
+To get started with MFIX-Exa, follow the user guide sections:
 
 .. toctree::
    :maxdepth: 1
@@ -73,12 +73,12 @@ any legal liability or responsibility for the accuracy, completeness, or
 usefulness of any information, apparatus, product, or process disclosed
 or represents that its use would not infringe privately owned rights.
 
--  MFiX-Exa is provided without any user support for applications in the
+-  MFIX-Exa is provided without any user support for applications in the
    user's immediate organization. It should not be redistributed in
    whole or in part.
 
--  The use of MFiX-Exa is to be acknowledged in any published paper based on
-   computations using this software by citing this MFiX-Exa site.
+-  The use of MFIX-Exa is to be acknowledged in any published paper based on
+   computations using this software by citing this MFIX-Exa site.
 
 -  The authors would appreciate receiving any reports of bugs or other
    difficulties with the software, enhancements to the software, and